After a bit of checking I worked out that the number must be the number of the blog and that I Use This For Testing is WordPress blog number 42,958,336.

This PhotographWorks blog is a lower number, which makes sense because I have had it a longer time.

Of course, I may be the last person in the WP blogosphere to realise this fact about the number of a blog. I may be person 42,958,336 – and everyone else knows it already.

Edit Someone Else’s Blog?

I tried substituting a different digit for one of the digits in the ‘42958336’ and wrote a short post. When I tried to save the draft a flash message came up that told me that there was an error and I couldn’t edit that post.

Which is what I expected, as I didn’t expect that I would be able to crash across and add a post to someone else’s blog or WordPress would be in a mess.